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X in (-oo:+oo)
((X^2-4)^2)/3 = 0
1*X^2 = 4 // : 1
X^2 = 4
X^2 = 4 // ^ 1/2
abs(X) = 2
X = 2 or X = -2
X in { 2, -2, 2, -2 }
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